| Reliance Power UK Ltd | Financial services | 2023 |
| Reliance SME Consultancy Ltd | Financial services | 2024 |
| Reline Care Ltd | Health & social care | 2011 |
| Relonix Removals Ltd | Construction | 2026 |
| Relso Limited | Other services | 2016 |
| Remarkable Catering and Events Limited | Other services | 2018 |
| Remarkable Catering Limited | Other services | 2018 |
| Remarkable Tech Ltd | Wholesale & retail | 2024 |
| Remimartyn Ltd | Real estate | 2022 |
| Renicam Ventures Limited | Professional & scientific | 2023 |
| Reno Assets Ltd | Real estate | 2025 |
| Renovation Resources Limited | Wholesale & retail | 2025 |
| Renurban Ltd | Administrative & support | 2025 |
| Renwick Bodyworks Ltd | Wholesale & retail | 2026 |
| Repp Building Limited | Construction | 2015 |
| Rerhou Trade Limited | Hospitality | 2013 |
| Reroot Kitchen Ltd | Manufacturing | 2025 |
| Reru Building Supplies Ltd | Wholesale & retail | 2025 |
| Rescue & Care Ltd | Health & social care | 2013 |
| Resideo Lettings and Management Ltd | Real estate | 2022 |
| Resilience Security Services Limited | Administrative & support | 2026 |
| Resilient Logistics Ltd | Transport & logistics | 2017 |
| Resin Artisans Co Ltd | Wholesale & retail | 2025 |
| RET Services Ltd | Other services | 2025 |
| Retro Nation Limited | Wholesale & retail | 2017 |
| Rettix Ltd | Wholesale & retail | 2019 |
| Retty Touch Limited | Other services | 2025 |
| REV24 Ltd | Wholesale & retail | 2022 |
| Revel Rise Ltd | Hospitality | 2026 |
| Revisions Music Limited | Information & communication | 2023 |
| Revitacore Ltd | Wholesale & retail | 2026 |
| Revo Transport Ltd | Transport & logistics | 2024 |
| Revolution Finance Brokers Limited | Financial services | 2018 |
| Rewarding Your Future Ltd | Information & communication | 2023 |
| REX Carpet Limited | Wholesale & retail | 2017 |
| REX Property Group Ltd | Real estate | 2020 |
| Rexedo PVT Ltd | Wholesale & retail | 2025 |
| Reyina Ltd | Construction | 2024 |
| Rezale Ltd | Information & communication | 2023 |
| RF Advisors Ltd | Administrative & support | 2023 |
| Rfconstructionandlandscaping Ltd | Construction | 2023 |
| RGE Arthur Ltd | Construction | 2018 |
| RGN Taylor Ltd. | Health & social care | 2022 |
| RHD Ventures Ltd | Other services | 2020 |
| Rhona BIA Ltd | Health & social care | 2018 |
| Rhyah Ltd | Hospitality | 2025 |
| Rhythora Creations Ltd | Arts & recreation | 2026 |
| Rian Transport Ltd | Transport & logistics | 2018 |
| Ricasare Group Limited | Transport & logistics | 2026 |
| Rich & Radical Ltd | Real estate | 2024 |
| Rich Mode Ltd | Construction | 2025 |
| Richa Shukla Ltd | Health & social care | 2021 |
| Richard Joinery Construction Ltd | Construction | 2015 |
| Richard Property Lets Ltd | Real estate | 2025 |
| Richard York Limited | Administrative & support | 2020 |
| Richbuild Construction Ltd | Construction | 2019 |
| Richmond Care Homes Ltd | Health & social care | 2026 |
| Richope Healthcare and Allied Services Limited | Health & social care | 2026 |
| Richwood Design & Build Limited | Construction | 2018 |
| Rico Rito Ltd | Hospitality | 2025 |
| RID Junk Ltd | Water & waste | 2023 |
| RIDE4SURE Ltd | Transport & logistics | 2025 |
| Rides & Deals Limited | Wholesale & retail | 2025 |
| Riggall and Hawkesford Ltd | Wholesale & retail | 2026 |
| Right Track (UK) Ltd | Extraterritorial | 2013 |
| Rihb Consultancy Limited | Other services | 2015 |
| Riko's Consultancy Ltd | Professional & scientific | 2021 |
| RIM Invest Ltd | Real estate | 2020 |
| Rim&Aesthetic Ltd | Other services | 2024 |
| Rine Logistics Ltd | Transport & logistics | 2026 |
| Rinky Couture Ltd | Other services | 2026 |
| Rinvee Wharf Tech Ltd | Information & communication | 2025 |
| RIO MAC Ltd | Hospitality | 2026 |
| Ripple Barbers Limited | Other services | 2020 |
| Ripple DRY Cleaners Limited | Other services | 2016 |
| Ripple Food Limited | Wholesale & retail | 2017 |
| Ripple Properties Limited | Real estate | 2023 |
| Ripple Supermarket Ltd | Wholesale & retail | 2018 |
| Rippleside Road Management Company Limited | Administrative & support | 2011 |
| Rise Distributions Limited | Wholesale & retail | 2017 |
| Rise Youth CIC | Education | 2025 |
| Riseupfootballcomunity CIC | Education | 2026 |
| Rising Dream UK Ltd | Real estate | 2021 |
| Risingstar Convergent Ltd | Wholesale & retail | 2021 |
| Riskyfashions.Com Limited | Wholesale & retail | 2013 |
| Ritchies Cafe Ltd | Hospitality | 2019 |
| Rithvi Ltd | Wholesale & retail | 2025 |
| River Flow Investments Limited | Real estate | 2024 |
| River House (Chelsea) Residents Association Limited(The) | Professional & scientific | 1978 |
| River Road Car Bazaar Ltd | Other services | 2025 |
| Riverflow (LDN) Ltd | Transport & logistics | 2026 |
| Rivergate Tabernacle Ltd | Other services | 2024 |
| Rivers of Joy | Education | 2011 |
| Riverside Antiques Limited | Wholesale & retail | 2023 |
| Riverside Best Seller Ltd | Hospitality | 2024 |
| Riverside Car Wash Ltd | Wholesale & retail | 2020 |
| Riverside Community Connections CIC | Education | 2019 |
| Riverside Haulage & Storage Ltd | Wholesale & retail | 2025 |
| Riverside Muslim Association Ltd | Health & social care | 2013 |
| Riviere Digital Systems Ltd | Information & communication | 2026 |